Volume 8 Issue 04

 

Title

FREE VIBRATION ANALYSIS OF GRAVITY DAM SECTIONS USING ISOGEOMETRIC ANALYSIS

Author 1RODNNY JESUS MENDOZA FAKHYE, 2ROBERTO DALLEDONE MACHADO, MATEUS RAUEN3, MARCOS ARNDT4
Source International Journal of Engineering and Applied sciences pg 01- 09 Vol 08. No. 04, 2016
Abstract Isogeometric Analysis (IGA) is a numerical approach that allows the discretization and analysis of continuous medium using the approximation functions generated in the construction of digital models or Computer Aided Design (CAD) models. In the present study, first IGA is applied in the study of two-dimensional linear elasticity problems and then to free vibration problems. .....

 

Keywords

Isogeometric Analysis; plane stress, plane strain; free vibrations

 

 

 

 

Volume 8 Issue 03

 

Title

INHIBITION OF CORROSION ON MILD STEEL USING PIPER GUINEENSE (UZIZA) EXTRACT IN SULPHURIC ACID MEDIUM OF VARYING PH VALUE

Author EJIEH, C.1* AND DR. EJIMOFOR, R. A.2
Source International Journal of Engineering and Applied sciences pg 01- 07 Vol 08. No. 03, 2016
Abstract

Many attempts are being made to curb the menace of corrosion in the industry. Recently, green inhibitors were widely considered due to their comparative advantage over other means of corrosion control and prevention. In this research, the inhibition of mild steel corrosion in sulphuric acid solution of varying pH values by Piper guineense extract as an eco-friendly and commercially available inhibitor was studied at room temperature by weight loss technique. Weight loss and corrosion rate reduces with increase in pH value. .....

Keywords

Piper guineense (uziza), mild steel, weight loss, corrosion inhibition, adsorption,

 

 

Title

STATISTICAL ANALYSIS OF PROGRESSIVE HYBRID TYPE-II CENCORED COMPETING RISS DATA

Author S.K. ASHOUR, W.S. ABU EL AZM
Source International Journal of Engineering and Applied sciences pg 08 - 22 Vol 08. No. 03, 2016
Abstract

In this article, we introduce a new scheme called progressive hybrid Type-II censoring scheme in the presence of competing risks (Type-II PHCS). Based on this scheme and assumed that the lifetimes of the failure times have an exponential distribution, the maximum likelihood and Bayes estimators of the distribution parameters are obtained, and the asymptotic confidence intervals and Bayes . ......

Keywords

Competing Risks, Type-II Progressive Hybrid Censoring, Exponential Distribution, Maximum Likelihood Estimation, Bayes Estimation, Lindley’s Approximation, Asymptotic Confidence Intervals

 

 

 

Title

COMPUTATION AS A SKILL FOR DEVELOPING DIGITAL DESIGN TOOLS IN ARCHITECTURE EDUCATION

Author 1SERDAR AŞUT, 2ARZU ERDEM
Source International Journal of Engineering and Applied sciences pg 23 - 27 Vol 08. No. 03, 2016
Abstract

This paper discusses the relationships between design cognition and tool use, particularly in architecture education. It claims that the rise in the use of Computer Aided Design (CAD) applications requires the reformation of curricula in order to enable the students to comprehend and customize the nature of CAD applications. . ......

Keywords

Architecture Education, Design Tools, Computer Aided Design, Computation, Design Cognition

 

 

 

 

Volume 8 Issue 02

 

Title

MATHEMATICAL MODELING FOR PERIODIC CAPACITATED ARC ROUTING PROBLEM

Author CLEVERSON GONÇALVES DOS SANTOS, 2 CASSIUS TADEU SCARPIN, 3 FAUSTO PINHEIRO DA SILVA
Source International Journal of Engineering and Applied sciences pg 01- 09 Vol 08. No. 02, 2016
Abstract

The objective of this paper is to present the main mathematical models for periodic capacitated arc routing problems, the applications and the differences. These problems consist of determining a set of routes in a given network over a planning period and the number of times that a certain arc should be played according to a hierarchy over the planning horizon ..

Keywords

Mathematical modeling, routing, multiple tasks

 

 

Title

SORET AND MAGNETIC EFFECTS ON THE ONSET OF CONVECTION IN A SHALLOW HORIZONTAL POROUS LAYER WITH THERMAL RADIATION

Author 1AMOS EMEKA , 2ISRAEL-COOKEY CHIGOZIE
Source International Journal of Engineering and Applied sciences pg 10 - 18 Vol 08. No. 02, 2016
Abstract

Convective flow in a shallow porous layer is studied. The horizontal channel is subjected to magnetic field and flux of heat and mass. Using the Darcy model with the assumption that the fluid is Newtonian and radiating, the governing equations were prescribed. For given values of the governing parameters , we obtained our numerical solutions using ‘mathematica’. Our results shows that a change in the sign of the stream function changes the direction of the flow from clockwise to anticlockwise or vice versa without changing the characteristics of the flow. The effect of Soret, magnetic . ......

Keywords

Soret, magnetic field, double diffusive convection, thermal Rayleigh number, porous medium

 

 

Title

BUILDING A MATLAB SIMULINK MODEL OF A FIXED DISPLACEMENT PUMP USING TEST PERFORMANCE DATA

Author ILIRIAN KONOMI, 2 ANDONAQ LONDO
Source International Journal of Engineering and Applied sciences pg 19 - 23 Vol 08. No. 02, 2016
Abstract

An attempt was made in the present paper to build a MATLAB Simulink model of a fixed displacement pump using performance coefficient model. The collected data from the pump performance test was used for graphically determining the performance coefficients. A MATLAB test rig was then build to test the pump model at nominal pressure 100 (bar) and nominal speed 1800 (rpm). The simulation results indicated that no significant difference existed between them and actual pump parameters ...

Keywords

Pump Performance Test, Fixed Displacement Pump, Lumped Coefficient Model, Performance Coefficient Model, MATLAB test rig

 

 

Title

ON A COMPUTATIONAL METHOD FOR SOLVING MIXED INTEGRAL EQUATION WITH SINGULAR KERNEL

Author F. A. SALAMA
Source International Journal of Engineering and Applied sciences pg 24 - 33 Vol 08. No. 02, 2016
Abstract

In this paper, under certain conditions, the existence of a unique solution of mixed integral equation of the second kind (MIESK) with singular kernel is considered and proved in the space , using Banach fixed point theorem. ...

Keywords

Mixed integral equation, system of Fredholm integral equations, linear algebraic system, singular kernel, Toeplitz matrix method.

 

 

Volume 8 Issue 01

 

Title

A PROPOSAL FOR PROBABILISTIC ANALYSIS OF STABILITY OF EARTH DAMS BASED ON FIRST ORDER RELIABILITY METHOD

Author 1TEREZA RACHEL MAFIOLETI, 2ANSELMO CHAVES NETO, 3JOSIELE PATIAS, 4LUIZ ALBINO TEIXEIRA JÚNIOR .
Source International Journal of Engineering and Applied sciences pg 01 - 08 Vol 08. No. 01, 2016
Abstract

A new probabilistic method for stability analysis of earthfill dams is presented in this paper. The method is based on First Order Reliability Method and, differently the traditional ones, considers some variables as random. Some important results pointed are: the probability of rupture and the reliability index for a structure. Real data from a cross section from Left Bank Earth Dam of Itaipu Hydroelectric Power Plant, located in Foz do Iguaçu, Paraná, Brazil, are used to illustrate the method. A back analysis of permeability coefficients are made before performing the stability analysis. Thereby, the actual flow conditions are considered, which allows obtain results consistent with reality ....

Keywords

Earth Dam, Probabilistic Stability Analysis, Probability of Rupture, Reliability Index. .

 

 

Title

DETERMINATION OF MATHEMATICAL MODEL FOR APPLICATION OF THE RELIABILITY OF STRUCTURAL ANALYSIS IN MONITORING AND CALCULATION OF RISK PROBABILITY IN CONCRETE BLOCKS OF ITAIPU DAM

Author ORLANDO CATARINO DA SILVA, 2 JAIR MENDES MARQUES, 3* ITAMAR PENA NIERADKA, 3** CARLOS ROBERTO MENDONÇA DA ROCHA.
Source International Journal of Engineering and Applied sciences pg 09- 18 Vol 08. No. 01, 2016
Abstract

Structural Reliability analysis is a mathematical technique applied to engineering that aims to study the behavior of geotechnical structures. This study aims to determine a mathematical model capable of monitoring a highly instrumented concrete structure, and through it perform the calculation of failure probability of a structural complex system. The proposed model is formulated from the method that uses the techniques of multivariate analysis to determine the possible failure modes to be monitored and their critical regions. Using this method we propose to define a performance multivariable function, ..

Keywords

Factor Analysis. Failure Modes. Performance function, Failure Probability.

 

 

Title

EFFECT OF SILICA TYPE ON SUPERHYDROPHOBIC PROPERTIES OF PDMS-SILICA NANOCOMPOSITE COATINGS

Author SENNUR DENIZ, BILGEN ARIKAN
Source International Journal of Engineering and Applied sciences pg 19 - 27 Vol 08. No. 01, 2016
Abstract

Polydimethylsiloxane (PDMS)-based coatings with superhydrophobic property prepared on various substrates by applying a suspension of suitable nanoparticles in PDMS have attracted much interest in industrial applications. Polydimethylsiloxane (PDMS)-silica nanocomposite coatings with different types of hydrophobic surface treated nanosilica were fabricated by coating a layer of fluoroalkylsilane (FAS) as a topcoat. The coating solutions of PDMS-silica were prepared by mixing PDMS with hydrophobic fumed nanosilicas having different surface groups in toluene and applied on to the cleaned aluminum alloy (Al) substrates by spray coating method. A layer of FAS-topcoat was applied on PDMS-silica nanocomposite coatings by using two . ......

Keywords

Superhydrophobic Coating, Polydimethylsiloxane, Fumed Nanosilica, Al surface, Water Conract Angle

 

 

Title

NEURO/FUZZY/BAYESYAN APPROACH FOR BEHAVIOR CHANGE DETECTION IN TIME SERIES RELATED TO DAM SAFETY MANAGEMENT

Author FERNANDO MUCIO BANDO, 2 JAIR MENDES MARQUES, 3 JOSIELE PATIAS, 4 LUIZ ANTÔNIO TEIXEIRA JUNIOR
Source International Journal of Engineering and Applied sciences pg 28 - 36 Vol 08. No. 01, 2016
Abstract

This article is aimed to present the efficiency of neuro/fuzzy/Bayesian approach in the detection of automatic behavior change in time series generated from monitoring instruments used in detection security management of a dam. The method for detecting change points in a time series is divided into three steps: clustering of the time series data using a self-organizing map of Kohonen; construction of a fuzzy set to transform the original time series with arbitrary distribution in a new series ...

Keywords

Dam Safety. Artificial Neural Network. Sets Fuzzy. Monte Carlo Simulation.